I recently went through the interview process for the Software Development Engineer - 1 (SDE-1) position at Zomato x Blinkit. The following is an account of my experience, which I hope will provide useful insights for other candidates preparing for similar interviews.
Online Assessment
The interview process began with an online assessment on the HackerRank platform. Here are the key details:
Duration: 90 minutes
Participants: 220 candidates
Format:
- 20 MCQs on core Computer Science subjects (OS, Computer Networks, DSA, OOPs, DBMS)
- 3 coding questions (topics: graphs, dynamic programming, strings)
Outcome: 18 candidates, including myself, were shortlisted for the next round.
Round 1: Technical Interview
This round was comprehensive, covering various technical aspects:
Project Discussion: The interviewer began by asking about projects from my resume.
Machine Learning:
- Explained the RAG (Retrieval-Augmented Generation) pipeline
- Discussed how neural networks work and their training process
- Explained the functioning of a neuron in a neural network
- Elaborated on embedding models like Word2Vec and how they utilize neural networks
DevOps and System Design:
- Docker containerization
- Kubernetes: its necessity and functioning
- Redis: scaling capabilities
- Load balancing
- Consistent hashing
Computer Networks:
- DNS functioning
- TCP vs UDP
DSA:
Problem: Maximal Square
- Implemented the solution on paper
- Discussed edge cases and optimizations
Key Strategy: I used illustrations and diagrams to explain concepts, which seemed to impress the interviewer.
Outcome: 8 candidates, including myself, advanced to the next round.
Round 2: Advanced Technical Interview
This round focused on practical implementation and system design:
Project Overview: The interviewer briefly reviewed all my projects.
Backend Implementation:
- Task: Implement backend request logic in Golang
- Focus: Optimizing using Golang's concurrency model (goroutines and channels)
- Additional scenarios: Implementing timeout and handling edge cases
System Design:
- Task: Design a rate limiter
- Challenges: Handling edge cases and optimizing memory usage
To demonstrate my continuous learning:
- Showcased my GitHub profile with 60+ repositories
- Presented my Notion website tracking daily DSA problem-solving
Outcome: 3 candidates, including myself, were selected for the final round.
Round 3: HR Interview
The final round was an HR interview focused on cultural fit:
Questions asked:
- Why do you want to join Zomato?
- What are your weaknesses?
This round was designed to assess how well I would fit into Zomato's work culture and team dynamics.
Final Outcome
Finally 3 students were given the offer including me.
Tips for Future Candidates
- Prepare Thoroughly: Cover a wide range of topics, including core CS subjects, DSA, and system design.
- Practice Coding: Focus on implementing solutions efficiently and handling edge cases.
- Showcase Projects: Be ready to explain your projects in detail and their technical challenges.
- Visual Explanations: Use diagrams and illustrations to explain complex concepts clearly.
- Continuous Learning: Demonstrate your passion for learning through personal projects and consistent practice.
- Stay Calm: The process can be challenging, but stay composed and think through problems step-by-step.
- Prepare for HR Questions: Be ready to articulate your motivations, strengths, and areas for improvement.